When it comes to memory issues, most people worry about paying bills on time or the last known whereabouts of a vital ring of keys. Then there's Dr. Rodney McKay, who wakes up on Atlantis strapped to a chair with no recollection of who he is or how he got there. Worse, he's been tasked with saving his teammates from an amnesia-inducing virus — which makes forgetting an anniversary seem benign in comparison.